Modeling and Advanced Query options in Microsoft Analysis Services Cubes support

Power BI have modeling and advanced query options for SQL Server datasources, but I can not use similar functionality for MS analysis services cube datasources, Do I miss something or this MDX lecel querying and modeling options are not ready for Power BI desktop yet ? I use, custom column generation and then sort this column using another data column in Power PI modelling feature for SQL server dataset but it is not possible for analysis services cubes datasets. Any comment or workarounds are apprecciated.